To change polarity rapidly. A plastic bar with two terminals and two brushes is pivoted to rotate over two contact strips so that its rotation reverses polarity of connections on the base.
To change polarity rapidly. A plastic bar with two terminals and two brushes is pivoted to rotate over two contact strips so that its rotation reverses polarity of connections on the base.
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To change polarity rapidly. A plastic bar with two terminals and two brushes is pivoted to rotate over two contact strips so that its rotation reverses polarity of connections on the base.